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Don't let them in, don't let them see
Be the good girl you always have to be
Conceal, don't feel, don't let them know

Elsa used these lines as her own "motto" earlier in the movie (during the song "For the First Time in Forever)Here however, she's sick of following this mantra. As if she's saying it for one last time so she can reject it for good and no longer care about concealing her powers.

Both parties are experiencing the same thing after breaking up. But what it means to them is so vastly different. The guy got time to kill, now has to find some way to pass the time, to deal with the loss. The girl got freedom. She's happy, he's not.(This is my favorite part of the lyrics. The contrast between what the guy feels and what the girl feels is captured so succinctly here. It's perfect).